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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa82816919a96d2b43f3c60aec171221005408726698184bc925e7238c40e58c' 
  AND token = 'eUH3u14Zix5IP2cRg+eA8EGN1LIupBuTNs2o8gCzfG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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