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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ecfb5241f8cc5e054e2f183e88e89b9d7194dc4ba2b85760f9a5b396e40ea55' 
  AND token = 'MOssnMInYhpTPJ9MW4E7vxSPly0cD9PVOw+prB0arUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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