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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd332a20c0d30d7194013778b63e8b94407c8eeef19e5d17676b08d229d01890' 
  AND token = '6JQnXomv0FJBd6WBKDZR5FB7C7tVcGdwjMjRx9eQhNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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