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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '975d5824e35b7cc180534d8e6e4be51e1b177c01ad2d54e1c9c9d46a90d0c40d' 
  AND token = 'tqljQuiGMvZPisUmpua7L3G8lejTN6CLlHfb7kJ3lik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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