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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8edddee68b8a5190ee91e7d639e8374a34c35977185fee6ad02c16addeba0868' 
  AND token = 'qM1akC5+FNry1Xl95C5wDZrhd0WatAJVKWy3D6d9tqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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