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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44ad6b0cab42e0263c35c1d50fcb5c51981f61ac635cc7347bc7b76ea6c266e' 
  AND token = 'uXM5V36Z3WPdcHZXf/IaBLKXuX7W3R8GT5v3flzBxpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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