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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea6fb92fab728e0cf5ef00b519a1d3227e6b40f6fb5eafa262df3a53ed5eee9e' 
  AND token = 'umk6yu2o56Z6UPRQSmsIWHz3Jh26F7qLpvEiW1mwr74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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