SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b911236a00ac046d45c1303b209499a6fbba5cc7d33d5b2954315b76e38b1e26' 
  AND token = 'EzD+hKLlliZNiJNsKKhWjrqsaAjQJlG6yBC++8mLvyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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