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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1252e6142ac4e5b5a417774ef932689129b3b673984d9bf96a29e856e5f1ad' 
  AND token = '/ex0mBkn1a+J+Cuzfk/EvHedJi6Qm+uxccJ3ySUQS48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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