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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a61c8371798ee6d18a8b7551c3fee9ef6e95c4fb9824111722cf2afe241fcba5' 
  AND token = '22Ch5MVhNUm4LT+WW3VBQZce9EAYXCKXRdFJ4XV349w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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