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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6c8b43a95e56aac78254e4963bdcc57a26d88454fa9e32e7df4a3a4b702984' 
  AND token = '/igbJrKz0CXlx1GayoIxyIu3urDG70MsAWfxvi4oBYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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