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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd812f1dc9fadf34b5022e78ddf475b69f89e28a6c5b15512b9ab4acec86d8c3' 
  AND token = 'kLUipooFSbcWPP6T6IHgeTst+TqIkXJWeC4uvErkLjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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