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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e843a49ec4b04ed74ece7792638a39964c120839ca47e1effaa95eb80c4e595' 
  AND token = 'KRkNdGMbU2X2UnCxWxIeXrT785HY4Lt48cd8VOqL6wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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