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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20af3095fe57e7241b98e31549f3c4cce42118802fc61b99ff817ffe2d7e433f' 
  AND token = '5NGHO7ZAXCo1mMj/48c5UYf0+mSP6p2/QFwbLRaVVTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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