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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '549fa8e917fc1510aa9b1b2922d682f21d460a0bff47bd65a1cc22b0816cd1b9' 
  AND token = 'WGzHtD5GnAbOjY16cyc5FWGdVB+Kn9+JsCekRfctXTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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