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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb20b44802591ee9217bd66c7b5c5a58755939ea7593226cadee7d16e739dfa' 
  AND token = 'RUQQnqTZExQaImcyXKUiv5fv/iJHBKIFHaHzovtBtWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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