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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9571f4ea8844c4f0f5e81763f1be9d02765218fbfb4e6f61544b3e3dcf8a395f' 
  AND token = '6oBf7P1Y5mnZWP+EjOj9Mzis2sOEcROLRvFWijd9H0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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