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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8bc1c4dc7a68a6ee16d2b17d26c19e7cfa990ac32b6fd5f9dfcb08598cb5a9b' 
  AND token = 'ONix8YzOdKI033FasLBuYf2MFp7WTnO5AuV3fyA8Ir0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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