SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9a07b215ccf5464e8d63dc91dd0dd9f5d0af500fab689318dac0f606b4d499' 
  AND token = 'CF9Y28161Pu66Cs6xJSVE9EaMCup+yU1Ls97OR3zUNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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