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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32d634761e14967a957ede3a0500698bc856a33bc744267912765ad9c5e6fb2' 
  AND token = 'MDEKNf9XBKD7GmWtckKvC3C57RqlqnqS76Hpm8O3nDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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