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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a285f7ce9c639e55fbcc2d18ac8e5a116c92877700d6e975862c4cc9f9c3008c' 
  AND token = 'LiQCTXnNynfEF49KoMn0yTd6IOhrM2VpGAddMs6OArA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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