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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e62b17d1c123cd40b1bf641b1e8353544606d9bbcdc0465ba73d8406fe65553' 
  AND token = 'LKjgh/mWbYXaPaK/toQ067mRxgkiEqbqUnZ0szjeLxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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