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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8eb2e1fa52039e2e3ea4487857864bae88a5ecc2a8bb7b2dcd87f67574b2a31' 
  AND token = '51WnUhGdst6fKpEzn3HL/duJ1hTcy7yqKwfjtrd270U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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