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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '655c51add0fbf8e529a5987c5c07c572269e37e0fbc4020f2f581bdd723b0ee9' 
  AND token = '1r5Er3rLIewUJVygk2JSreh/vD2zPmMNWDD+8lgFww8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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