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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a618418cba7c7e59f59f7f16c89fa5e29b35721b20355a00d6a0132682d8ea7' 
  AND token = 'GMBPDibMLQVS0YAZQ9HlHokNcIZTJ8TfWBQtMnxQ1HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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