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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9f873e4da04cd99d65589303f33134ddc3e697dbde4d69a50d8ebe59b5e771' 
  AND token = '3NqsV+TMXb9B5VWeOgUtT5hGYD+ufG5l9WjOhYS749E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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