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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cbc48469b2a39bbb336a22dcb0c3146d981cdaccd6ef8ecfaa5a13d5bf26474' 
  AND token = 'gUZz9+L+RyeYiLA0LPLrMRwo7v1xMmKGmmqNrAiPX6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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