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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4433642345e67f5bbdcc81444189d8094778b58c9d10fe1b63f0dc461005efe6' 
  AND token = 'Ue7eiBpzYj0ouvgHgZ+M9XlrkS91bwhfQHRITvzATDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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