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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec4f84f8e6e2f1754c14ce86355645b6e93b67237cb0c093f77141ae532365a7' 
  AND token = 'my28p30JR5AyctzHdgbI2d2SuIliTiYRhLsfq5wi3zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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