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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4feec67a6360e4f79cef9a6d8a4cf4914cfcd5e7f68ddd8b2a77a942cc680bda' 
  AND token = 'UizX9FsUep0Oi5GLtkwe9kzDCjUNJDcc+5LjyUqWoxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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