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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4586c76c6291a34ffaf32e942c6db23bc6e3159cff78ed5f034d06ba8dfb3cf' 
  AND token = '65Z68YhTTUbE6LxnW3akgMaqxfjc9bgRsIc3iTMaIqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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