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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a15bf4b43c191b16ca8dca804dce04f2c3161971a8822779ffceee61ec7da5ee' 
  AND token = 'bAD1AaKOm9kPPktGzoR1n4bJNymeciiqfo/V5nmz2IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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