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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f9e38d884e88a6bd2fb43ce7fc73441c58af44df9ade4386da729d5846839fd' 
  AND token = 'jK4Z+TC5V0GpSy1eKAX/E6Z6K74leakRDRBnDZlXw+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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