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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f1e76e3f675e53d69a7f73c1010da98004c8848cb916062fd86c3da437d3ee' 
  AND token = 'k48d+I45l78gXHBJJJMm1OWb1HvuATVuF33YllaUzj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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