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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942172879a203c166200ebb82ca2748ad3ddfea4021e6dd2d510670824a43efb' 
  AND token = 'ub79rhWWpp/pd0z6D72hQLeU7y3RKJAsgc8PAVvFW3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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