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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e36f1395eb048d09efac3cc694c4f6258a8cf6ebc64da8fe1d2e8df7482f671' 
  AND token = '8/ydqAkUg4aIFGHVDlJ3QXdzLTHafweN01T1XPZaMFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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