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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795f45863fab736d68a9186307013cf803bd04738704c89968f959013bcd032f' 
  AND token = 'yRtGk81QQWoNErFGxkQTf8rLpB+c8FbaZ5udc0vf21M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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