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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bdfa24ce5c6b5cfc216b6d6ed66392e4f24a7ab60029eaf8d4e2cf45ca18722' 
  AND token = 'ZfDG9XhX2VZLyWMspGjT0M7AfacD3kwdq8TYTdmKkmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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