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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '615af1c0c48a2fe04af6c32e94305273c7e7047c1ddba1065f52d2e24e7be41a' 
  AND token = '71QU7fYVt+cIb0t1KV8DGFlXlaX7dBNGgUHwuij7RW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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