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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68acf428754a6dd1788c52a893bd39461ca9faad4238eaeedb8b6fa5e233ae2' 
  AND token = 'CK5fAo1Do7PiRKa4wbhUc+ajUiGZfCbQu5gcdGxHvPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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