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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cac2747a12cce59d6b72bb64b61a86948b5ee5f0df214736c899a36bc8c71ff' 
  AND token = 'y+TaG8GTIQeveatNriKki5apA03JkdWdFqne0uQM//M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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