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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48262f33d71a8d6f55bf10494f9b6961d63cd9bdaf4fa2b4ab0bbe243cfff200' 
  AND token = 'WBC/URVLWr2O0I5VK6xa84b5BUzrgzzlQ5TXfJDAVC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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