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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a20fad793aba5c4788b0a9016809ea65a2a0aa6fbbb2d17a4c0a52282616f94' 
  AND token = 'RqRcq0MnInmiywWDzVqz6IS6Y8Ewen7siTANypvtYoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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