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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '047f054ac330db9ad5cb339bdd7b45c87ac168fc0a6e73a24fda78e4074aff82' 
  AND token = 'QdjhdjfViq24X/84XHUNHXP+MuQXdbU3g801ajZN/d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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