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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda7517a68eb5a0dc3da6b6a215d214c0a9c867d41748559daf953d577db32f4' 
  AND token = 'lHIigjSQuRcD903Xpq88rVWiuJ0cvSSnFq7r0mW3UDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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