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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3672e5223930244a29cf59b11bc073c4dc4ba112d466c319a716050db997d376' 
  AND token = 'rfc7plBiXKDy4pk9EG4xWJOCyvdVFfOzukUutgK2NFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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