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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf62ec5c7aa339f9ac60e771fc669f08afeedeb4a1ef685a98cdcbb53a590979' 
  AND token = 'DllHSi+ilw7GSZQR3zxrB376WdegfyKN7fXAnJLC7Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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