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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fa97db59626d9b10123ea2ec26164369a26aea8eebfdfc2a84a694f978c9db6' 
  AND token = '3MDV4qyQiJmpAnCE6ZFc1h7ZdfcmP7aEm7Tw7/jJ0e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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