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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba4d3d746a90382fea58b045ce1a154f21b58eda06b47256ea35646a7599fda' 
  AND token = 'z2uSny1xeulwIxxWyaxP6+zLjKANrslUMVfLA3S4uzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}