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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b64e6065528925c9ea764ec98318edd2f0e2becba31ae56ce2d47aafc1e9aab' 
  AND token = 'ql1sE2c28ivN9cg+5ZuB8S+4W7xijHWRTj5dz5k4dng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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