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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d17d6647752ad1994dc0b697c3af7d3190c90620848f8ce682260dada8bfc6f' 
  AND token = 'ZLyOFVdI57rXKP8KWw8BIQDZwt8kA6XBfmii7L2xHgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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