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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174c28e92b505438844805146c95d16ab64337f6ab2125aa9b78eed8fd2bf0d2' 
  AND token = 'XAw/kwElnz8k9Cq3nlN9SObqazCrJ5mCmImAKnNno6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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