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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfcd1d02c95de2734be68657fbcb8ddffbe8b4182e78e085cb1293b58315f061' 
  AND token = 'SJANNF+V+zR9IRlrG63D//AnQd66IbaefMRWsE7vQ9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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