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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '818a92ac62422ce3b6d1c9dc8d85414d8749baf3c7dd4a437abaa1eacfe7d381' 
  AND token = 'KAnmxNYt4WGanLL/g54DICy2jQfWVT7ggIHr3ZeZFWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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