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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9dcc46204850e5dba9aea730ea716334110cc85aa92ae0b6b6b996a9c237b3' 
  AND token = 'TK1z8792407wrt6hdFP8ejerP/WZ7DsUkv9TDJxqLjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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