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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1196e19bb02100a5feafecc0222959fe7832236b5c80096463ac1592299c532c' 
  AND token = 'D5ZEBg6GxQrb5eoRNs1ISmmYIBkAshbQwxRwG7grMvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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