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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1243fbd86f2cff4b83a7f90f6353ec3d2354295a7cd38c2ee8ed2b44073e698' 
  AND token = 'f/rI9l9iulIJHcmr24oGslxtDOxqQ+gMixUlzYplPIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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