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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f5b3481de16ae35d0b4cb20b1ccde3276c4592450bad779a7a7e00bb585169' 
  AND token = 'SuWNRG2Wsz21uWIxCRddIzsKxUGd0FZhD44kL/a/7r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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