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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67a04481b044afd4a105878e2b20e18f7e975f3c019c04acb1eabb1f3936a399' 
  AND token = 'aCgR7saOAzS/q5x9acuzDL1yWHYFxj4Q8AZKAqc7XvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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