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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfcea61191cf7c683bb34c2cea6587ee5986a17cf62ff38e66e3bc44d0de44e1' 
  AND token = '2fn6hWzffECtAtCwsruSTZKxpyzfjunaN+PNklFYzio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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