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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32aa9cc13b97fdcac6335e8078e8c7cba30982e266f886058eb28ca5d83a202f' 
  AND token = 'GtQJXpzPzc3N+sMg207XPaf/mOmLyUeq9O5HtGGFUww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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