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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72c1a8eb5f8fa1d1a4530f61af8a2ed3146c09aa8955693ce609cbeed93cb5b1' 
  AND token = 'lAPjNJM6UUMlGsjUWV49+nUgAjH1SVbnj5W8tuvczuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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