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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72798d2c866beefe16f422c2102b1fc030a62075b67c9e1401f985da854cd772' 
  AND token = 'e54nutvL9P3s6bazQPNLruty6J4eveaSPN0S3qJstDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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