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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d3c1c068c9920243bfcb794500b85480ab67778a923720c23302a6dba3b205e' 
  AND token = 'st542QemSm2Oy2nH5qxlXduzw/m0DeB6/ksCfLN2ozk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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