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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff90ba3b345a931449c8f403f1dc56129fd0fba72da4b31e6f9c2f1299d11d7' 
  AND token = '02LRZSzuHt+tT/ZbGFHlpKTSiOCMISKyJUUes108R1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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