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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94408e846dd5c6a6abd97711fb69ff61b5b3308c9676a0e630241b353ec65a27' 
  AND token = 'Okjk/RxjUKp1mNNdHlXfeUcIRB4ijCcPoVPYS9bk7CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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