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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ff924a850ca5e7ca394cb4047acf640c841b92c3527c23ce0bd1192b71306c7' 
  AND token = 'guMi8fA3+H3rDaQTmdnKmj7PeI6QqGuql0vIle9bVqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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