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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1f5a06d4122e3f28d280059e834f88a6123c0933ec23754951d156eb63f5cf0' 
  AND token = 'ojb+ycTIPaYHJDkwZaaDjOlL+M+AmquYyU9ZtJdiwJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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