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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361d43c9ff31b6e7a2c02945b2e1c230fa30a7fca9009c49da6a911766cf06f9' 
  AND token = 'BOalHI5ca5iVDu3FiqGNW6gQ9bmPp2wO2TyIeY7nl9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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