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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079967c525b24658d312b131b8ca5bb850ec62515a9772b38717eb0be5ac7c15' 
  AND token = 'kPR/XUCxaFqK7r3KGG/DpFJH1qLhJqe2k2kuU4wySHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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